Lamp locking-base.



W. A. CHEW, LAMP LOCKING BASE. APPLICATION FILED 0CT.23.19\6.

I Patented June 12, 1917.

"l, A, Inventor messes I 73 if Attorneys view which will appear as the description "UNITED STATES WILLIAM A. CHEW, OF ATLANTIC CITY, NEW JERSEY.

' LAMP LOCKING-BASE.

Specification of Letters Patent.

Patented June 12, 1917..

Application filed October 23, 1916.- Serial No. 127,240.

To all whom it may concern:

Be it known that I, lVILLIAM A. CHEW, a citizen of thegUnited States, residing at Atlantic City,'in the county of Atlantic and State of New Jersey, have invented a new and useful Lamp Loeking-Base, of which the following is a specification.

': creased certainty ,of operation may be secured.' It has been found in practice,'with the type of lamp! bases indicated, that if the seating thereof in the socket has been forcible, there is frequently sufiicient fric-- vtion secured between the relatively movable parts of the base to permit of backing the exterior shell out of the'socket without injury to the 'lead wires or-filament; and moreover that with present commercial 'types, the use of spring pawls for imparting motion from the lamp base to the shell,

both in seating andj unseati'ng the latter in the socket, involves the risk of the backing pawls engaging the wall of the shell before the lead wire'or filament has been broken,

thus enabling the operator to unseat the shell without permitting the, parts of the device to perform their'intended functions.

It is the purpose of this invention to provide such means for communicating motion from the base to the shell as to guard against this improper manipulation and insure the destruction of the lead wire or filament before the unseating of the shell from the socket can be accomplished.

With the foregoing and other objects in proceeds, the invention resides in the com bination and arrangement of parts and in the details of construction hereinafter described and claimed, itfl-beingunderstood that changes in the precise embodiment of the invention-herein disclosed, can be made within the scope of What is claimed, with-. out departing from the spirit of the invention.

In the drawings y Y Figure l is a side view ofa lamp base structure embodying the invention.

' Fig. 2 is an axial sectional View of the same showing its parts in their normal or operative positions.

, Fig. 2.

' Fig. 5 is a transverse sectional vlew taken Fig. '3 is a similar view taken on a plane at right angles to Fig. 2 on the plane indicated by the line 33 of Fig. 2.

' Fig. 4 is a transverse sectional View taken on the plane indicated by the line H of on the Fi I In the construction shown, the base proper is indicated by 1 0 and is arranged within a shell 11 having the common threaded surface for engagement with a lamp socket of the ordinary type (not shown). The shell 11 has the usual porcelain cap 12 which is connected with the base 10 by means of a plane indicated-by the line55 of tubular thimble 18, said thimble forming the passage through whichextends the lead wire of a filament 14, which should be broken in attempting to unseat thev lamp from its socket. i

In the construction illustrated, the thimble l3 provided at its inner end with a flange 14 having outwardly projecting spurs 15, which enter an insulating washer 16 held to the base 10, as shown at 17. The Washer '16 preferably'is made of soft paper or other material adapted to perform the function of an insulator but capableofbeing torn or destroyed readily when an attempt is made to remove the base 10 outwardly from the shell 11. At its other 'end, the thimble 13 is flanged or swaged as at 18 over a cupped washer 19, which is thus interposed between the flange 18 of the thimble and a contact member 20.- This contact member 20 preferablyconsists of a small blank of copper or similar metal having an eye21 through which the thimble 18 projects, and a contact cap 22 connected by an integral,

bendable, reduced neck 23 with the body portion of the contact men'iber. The construction described provides for the free swiveling of the contact cap 22 with respect; to the shell 11, and after the lead wire 1&

has been carried through the thimble 13, subsequent to the sealing of the bulb in the base 10, and has been soldered to the washer 19, the contact cap 22 should be pressed down. over the washer and over the end of electrical contact in the socket. The base 10 may then be turned or revolved with reference to the shell 11, regardless of the force with which the shell may have been screwed into the socket, without tending to impart the thimble, as shown in Fig. 3, to form the BEST AWtlEflBLE COP reverse motion to the shell in the direction necessary to unscrew it from the socket. In order to remove the shell 11 from the socket, it is necessary first to draw outwardly upon the base 10, with a force sullieient to break the washer l6 and the lead wire 14 as hereinafter fully explained.

The means for connnunicating clock-wise or Stltilllfl movement t'rdm the base 10 to the shell It consists of single tongue spring pawls 43. two of which are illustrated. secured in any suitable manner to the base It) and projecting outwardly therefrom along substantially tangenthil lines, and a stop or inward projection it on the shell in the path of said pawls when the base is in its normal position with relation to the shell as shown in Fig. 2. The stop or projection 24 is provided with an abrupt side for terminal engagement by one of the pawls l3 and with an inclined or beveled opposite side whereby reverse or contra-elm'kwise movement of the base It) will cause the pawls to slip over the stop r project-ion without impartingmovement to the shell 11.

The means for connnunicating the eontraclock-wise or nns ating movement from the base It) to the shell it consists of a pro ection :25 extending exteriorly from the base for engagement with a stop or inward projertion 2!; in the shell. In order to bring the unscating members into a transverse plane which will permit of their engagement, the base 10 must be moved axially within the shell 11 a distance sutl'ieient to break the insulating washer 1G and the lead wire 14, or stated ditl'erently, to the position indicated in. Fig. 3; In other words, when the seating means consisting 'of the pawls t3 and the stop or projection Q-l are in the same transverse plane, permitting of engagement thereof for the purpose of seating the shell.

11 in the socket, the nnseating means consisting of the projections 25 and 26 are out of alinement or are in different transverse planes, and are held out of alinement by the engagement between the thimhle 13 and the insulating washer 16, and the movement of the base 10 to bring said unseating means into operative relation destroys the usefulness of the lamp.

Having thus described the invention, what is claimed is v 1. An electric lamp having a base comprising an outeesoeket engaging shell, and an inner bulb carrying shell, a swivel connection between said shells including a frangiblei'aslu adapted to be fractured by relative outward movement ot' said parts, and seating and unseating means, the members of which are carried respectively by said shells, and the members of one means being cut out of operative relation when the members of the other means are in operative relation.

2. .\n electric lamp base comprising an outer socket engaging shell. and an inner bulb carrying shell, a frangible insulating washer carried by the inner shell, :1 thimble minally detachable from one of said shells by longitudinal movement of the inner shell, and seating and unseatmg means, the members of each of which are carried respectively.

by the inneand outer shells, the members of one of said means being out of operative relation when the members of the other means are in operative relation;

-t-. .\n electric lamp base comprising an outer socket engaging shell and an inner bulb carrying shell capable of relative rotary and outward movements, a swivel connection between said shells to normally prevent r elati\e axial movement thereof, and terminally detachable from one of said shells by forcible outward move-- ment, and seating and unseating means, the membersof each of which are' carried respectively by the inne' and outer shells, the members'of one of said means being out of operative relation when the members of the other in nuts are in operative relation.

5. An electric lamp base comprising an outer socket engaging shell and an inner bulb carrying shell capable of relati\ e rotary and outward movements, a frangible washer seated ill the mner shell, a thimble en 'a ing said washer and revolubly mounted in the other shell, and a contact cap swiveled upon the outer shell and covering the ex posed end of said thimble, and seating and unseating means, the members of each of which are carried respectively by the inner and outer shells, the members of one of said means being out of operative relation when the members of theother means are in operative relation.

(3. An electric lamp base comprising an outer socket engaging shell and an inner bulb carrying shell adapted for relative rotary and outward movements, a swivel connection between said shells including a thimble detachably engaged with the inner shelland having one lead wire attached thereto, a contact cap swivelcd upon said thimble and covcringthc exposed end thereof, and seating and unseating means,'the members of each of which are carried respectively by the inner and outer shells, the

members of one of sa' means being out of operative relation when the members of the other means are in operative relation.

7. An electric lamp base comprising an outer socket engaging shell and an inner bulb carrying shell adapted for relative rotary and outward movements, a swivel connection between said shells including a thimble terminally seated respectively thereon, and having one of the lead Wires con nected therewith, a contact cap having an eye loosely receiving the outer end of said thimble, and also having a contact memher for covering the exposed end of said thimble, and seating and unseating means, the members of each of which are carried respectively by the inner and outer shells, the members of one of said means being out of operative relation when the members of the other means are in operative relation.

8. An electric lamp comprising an exterior socket engaging shell and an inner bulb carrying shell adapted for relative rotary and outward movements, a swivel connection between said shells including a thim ble having a flanged outer extremity, a con tact. cap covering the exposed end of said thimble, and having an eye'loosely engaging the thimble, between said eye and the flanged extremity of the thimble, and having a lead wire ata cupped washer interposed tached thereto, and seating and unseating means, the members of each of which are :arried respectively by the inner and outer shells, the members of one of said means being out of operative relation when the members of the other means are in operative reation.

9. An electric lamp base comprising an outer socket engaging shell, and an inner bulb carrying shell adapted for relative r0- tary and outward movements, a swivel connection between said shells including a thimble detachably engaging one of said shells, seating means consisting of a single tongue pawl carried by one of said shells, and a beveled projection on the other shell normally arranged in the path of said pawl, and unseating means consisting of outward and inward projections respectively from the inner and outer shells, and normally arranged in difierent transverse planes and adapted to be disposed in a common transverse plane by relative outward movement of the shells;

In testimony that I claim the foregoing as my own, I have hereto aihxed my signature in the presence of two witnesses.

WILLIAM A. CHEW. Witnesses: p

ELIZABETH -CHEW, FANNrs C. A'rrzms. 

